CO here is an extreme LAG. I also just took a very nice pot off him last hand. MP2 is very loose passive.

Party Poker 2/4 Hold'em (9 handed) converter

Preflop: Hero is UTG+1 with J:club:, J:diamond:.
1 fold, BB calls, Hero calls, MP2 calls, MP3 calls.

Flop: (15.50 SB) 6:spade:, 3:club:, 3:diamond: (5 players)
BB checks, Hero bets, Hero calls, MP2 calls.

Turn: (13.75 BB) T:heart: (3 players)
Hero bets, Hero calls, MP2 calls.

River: (19.75 BB) 2:heart: (3 players)
Hero checks, MP2 checks, CO bets, Hero calls, MP2 calls.

Final Pot: 22.75 BB

Looks pretty good to me

Maybe an argument for a cap preflop against these jokers, but probably not with MP3 and BB along for the ride
It's kinda a tossup

I'd three bet the turn most likely or maybe a funky little check raise again if the reads are good.

I'm not going to respect an overpair from either of these goofs

Definitely check/call the river since you haven't improved

That's exactly why you should cap preflop, imo. You got people in the hand with inferior holdings to pad the pot when you capped incorrectly.

Note: I don't recommend capping JJ most of the time. Here it seems reasonable, imo.

Rest played good.

I'd definetly cap PF w/JJ here. I'd probably go into call down mode UI on the turn though

cap preflop. checked /called the turn and river. thats the only thing i would maybe do differently